<template>
  <div class="swiper-container">
    <div class="swiper-wrapper">
      <div 
      class="swiper-slide" 
      v-for='(item,index) in skuImageList' 
      :key="item.id"
      >
        <img 
        :src="item.imgUrl" 
        :class="{active:defaultIndex === index}" 
        @click="changeImgActive(index)">
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>

  import Swiper from 'swiper'
  export default {
    name: "ImageList",
    props:['skuImageList'],
    data(){
      return{
        defaultIndex:0
      }
    },
    //点击略缩图给他增加一个类名
    methods: {
      
      //点击略缩图增加一个active类名
      changeImgActive(index){
        this.defaultIndex = index
0
        //点击改变大图
        this.$bus.$emit('changeBigImgIndex',index)

      }
    },
    watch: {
    skuImageList: {
      //公共组件有的需要立即刷新有的不需要可以都加上
      immediate: true,
      handler() {
        this.$nextTick(() => {
          //加了immediate，会在数据没有时也会刷新，会有滑动问题
          //判断数据是否为空
          if(!this.skuImageList.length) return
          new Swiper(".swiper-container", {
            direction: "horizontal", // 垂直切换选项
            // loop: true, // 循环模式选项
            slidesPerView:4,
            slidesPerGroup:4,

            // 如果需要分页器
            pagination: {
              el: ".swiper-pagination",
            },

            // 如果需要前进后退按钮
            navigation: {
              nextEl: ".swiper-button-next",
              prevEl: ".swiper-button-prev",
            },
          });
        });
      },
    },
  }
  }
</script>

<style lang="less" scoped>
  .swiper-container {
    height: 56px;
    width: 412px;
    box-sizing: border-box;
    padding: 0 12px;

    .swiper-slide {
      width: 56px;
      height: 56px;

      img {
        width: 100%;
        height: 100%;
        border: 1px solid #ccc;
        padding: 2px;
        width: 50px;
        height: 50px;
        display: block;

        &.active {
          border: 2px solid #f60;
          padding: 1px;
        }

        &:hover {
          border: 2px solid #f60;
          padding: 1px;
        }
      }
    }

    .swiper-button-next {
      left: auto;
      right: 0;
    }

    .swiper-button-prev {
      left: 0;
      right: auto;
    }

    .swiper-button-next,
    .swiper-button-prev {
      box-sizing: border-box;
      width: 12px;
      height: 56px;
      background: rgb(235, 235, 235);
      border: 1px solid rgb(204, 204, 204);
      top: 0;
      margin-top: 0;
      &::after {
        font-size: 12px;
      }
    }
  }
</style>